package com.project.shiro;


import com.project.bean.UserBean;
import com.project.service.IUserService;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cache.MemoryConstrainedCacheManager;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class CustomRealm extends AuthorizingRealm {
    @Autowired
    private IUserService userService;

    public CustomRealm(){
        //定义凭证管理器
        HashedCredentialsMatcher matcher = new HashedCredentialsMatcher();
        //设置加密算法
        matcher.setHashAlgorithmName("md5");
        //设置散列次数
        matcher.setHashIterations(1024);
        //设置编码
        matcher.setStoredCredentialsHexEncoded(true);
        this.setCredentialsMatcher(matcher);

        //开启缓存管理
        this.setCacheManager(new MemoryConstrainedCacheManager());
        //开启全局缓存
        this.setCachingEnabled(true);
        //开启身份认证缓存
//        this.setAuthenticationCachingEnabled(true);
        //开启授权缓存
        this.setAuthorizationCachingEnabled(true);
    }
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        //得到登陆主体。由登陆时，存放的主体决定
        UserBean user = (UserBean) principalCollection.getPrimaryPrincipal();
        if (user!=null){
            SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
            //添加角色
            user.getRoleList().forEach(n->{
                info.addRole(n.getName());
            });

            //添加权限
            user.getGradeList().forEach(n->{
                info.addStringPermission(n.getContent());
            });
            return info;
        }
        return null;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        //得到用户名
        String username = authenticationToken.getPrincipal().toString();
        //调用业务方法，得到用户名对应的对象
        UserBean user = userService.findByName(username);
        if (user!=null){
            return new SimpleAuthenticationInfo(user,user.getPassword(), ByteSource.Util.bytes(user.getSalt()),this.getName());
        }
        return null;
    }
}
